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Date: Mon, 5 May 2025 11:00:09 -0700
From: Nathan Chancellor <nathan@kernel.org>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jonathan Corbet <corbet@lwn.net>, iommu@lists.linux.dev,
	Joerg Roedel <joro@8bytes.org>,
	Justin Stitt <justinstitt@google.com>,
	Kevin Tian <kevin.tian@intel.com>, linux-doc@vger.kernel.org,
	linux-kselftest@vger.kernel.org, llvm@lists.linux.dev,
	Bill Wendling <morbo@google.com>,
	Nick Desaulniers <nick.desaulniers+lkml@gmail.com>,
	Miguel Ojeda <ojeda@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>, Shuah Khan <shuah@kernel.org>,
	Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>,
	Will Deacon <will@kernel.org>, Alexey Kardashevskiy <aik@amd.com>,
	Alejandro Jimenez <alejandro.j.jimenez@oracle.com>,
	James Gowans <jgowans@amazon.com>,
	Michael Roth <michael.roth@amd.com>,
	Pasha Tatashin <pasha.tatashin@soleen.com>, patches@lists.linux.dev
Subject: Re: [PATCH v2 15/15] iommupt: Add a kunit test for the IOMMU
 implementation
Message-ID: <20250505180009.GA717568@ax162>
References: <0-v2-5c26bde5c22d+58b-iommu_pt_jgg@nvidia.com>
 <15-v2-5c26bde5c22d+58b-iommu_pt_jgg@nvidia.com>
 <20250505174458.GA226031@ax162>
 <20250505174747.GA4155135@nvidia.com>
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In-Reply-To: <20250505174747.GA4155135@nvidia.com>

On Mon, May 05, 2025 at 02:47:47PM -0300, Jason Gunthorpe wrote:
> On Mon, May 05, 2025 at 10:44:58AM -0700, Nathan Chancellor wrote:
> > On Mon, May 05, 2025 at 11:18:45AM -0300, Jason Gunthorpe wrote:
> > > This intends to have high coverage of the page table format functions and
> > > the IOMMU implementation itself, exercising the various corner cases.
> > > 
> > > The kunit can be run in the kunit framework, using commands like:
> > > 
> > > tools/testing/kunit/kunit.py run --build_dir build_kunit_arm64 --arch arm64 --make_options LLVM=1 --make_options LLVM_SUFFIX=-19 --kunitconfig ./drivers/iommu/generic_pt/.kunitconfig
> > 
> > Just a small comment about the command:
> > 
> >   --make_options LLVM=1 --make_options LLVM_SUFFIX=-19
> > 
> > can be simplified to just
> > 
> >   --make_options LLVM=-19
> > 
> > You should never need to specify either LLVM_SUFFIX or LLVM_PREFIX.
> 
> Oh wow, I had no idea. Can I encourage you to send a patch for 'make
> help' to explain how to use it?

I will see if I can come up with something concise for 'make help' but
we have it written up in Documentation/kbuild/llvm.rst:

https://docs.kernel.org/kbuild/llvm.html

Cheers,
Nathan